Dorman 674-428 Exhaust Manifold

Exhaust Manifold for GM 2.0L and 2.5L Applications

This Dorman exhaust manifold, part number 674-428, is a standard replacement built to match the fit and function of the original manifold on specified vehicles. It is made from cast stainless steel with a metallic gray finish and includes the heat shield needed for a complete exhaust-side repair.

Key Features

• Cast stainless steel construction for exhaust durability
• Rectangle port shape with an 8-hole mounting pattern
• Collector port diameter: 1.735 in.
• No oxygen sensor port
• Heat shield included
• Mounting hardware included
• Standard replacement grade
• Part number 674-428

Detailed Description

Dorman 674-428 is engineered as an OE-style exhaust manifold for select Chevrolet, Buick, Cadillac, and GMC vehicles. It is designed for direct replacement use on applications such as the Chevrolet Camaro, Malibu, Equinox, and Traverse, along with Buick Envision, Regal, Regal Sportback, and Regal TourX, plus Cadillac ATS, CT6, CTS, and GMC Terrain. The cast stainless steel body and integrated heat shield support a repair that follows the original manifold layout and mounting points.

This part cross-references GM OE numbers 12627069 and 12651064 for the same application. If you are searching for an exhaust manifold for a 2016-2023 Chevrolet Camaro, a 2013-2022 Chevrolet Malibu, or a 2018-2021 GMC Terrain, part number 674-428 is built for those listed fitments.

What It Helps Fix

• Cracked or warped exhaust manifold housing
• Exhaust leaks at the manifold flange
• Broken or missing heat shielding at the manifold area
• Noise from a leaking manifold on GM 2.0L and 2.5L applications
• Fitment issues caused by a damaged original manifold

Installation Notes and Tips

Verify engine and vehicle fitment before installation, since this manifold is listed for specific year, make, and model applications only. The manifold uses a rectangle port shape, does not include an oxygen sensor port, and is supplied with mounting hardware and a heat shield. Use the included downpipe hardware and gaskets referenced by the manufacturer for a complete repair where applicable.

Quality Assurance

Dorman manufactures this exhaust manifold as a precision-engineered replacement part for specified vehicles. The design focuses on matching original fit and function, with materials and hardware selected for a direct repair on supported Chevrolet, Buick, Cadillac, and GMC applications.